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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be   <a href="subset_1.html#NM2">Subset</a> of <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/>





<b>assume </b><b>that </b><br/><a NAME="E1:21"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="cqc_the3.html#R4" target="_self">|-|</a> <font color="Maroon">c<sub>2</sub></font>
 <b>and </b><br/><a NAME="E2:21"/><i><font color="Green">E21</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="cqc_the3.html#R4" target="_self">|-|</a> <font color="Maroon">c<sub>3</sub></font>
 ;<br/>

<a NAME="E3:21"/><i><font color="Green">E22</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E1:21"><i><font color="Green">E20</font></i></a>, <a class="ref" href="cqc_the3.html#T18" target="_self">Th18</a></i>;<br/>
<a NAME="E4:21"/>
<font color="Maroon">c<sub>2</sub></font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E2:21"><i><font color="Green">E21</font></i></a>, <a class="ref" href="cqc_the3.html#T18" target="_self">Th18</a></i>;<br/>
<a NAME="E5:21"/><b>then </b><i><font color="Green">E23</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E3:21"><i><font color="Green">E22</font></i></a>, <a class="ref" href="cqc_the3.html#T9" target="_self">Th9</a></i>;<br/>
<a NAME="E6:21"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E1:21"><i><font color="Green">E20</font></i></a>, <a class="ref" href="cqc_the3.html#T18" target="_self">Th18</a></i>;<br/>
<a NAME="E7:21"/>
<font color="Maroon">c<sub>3</sub></font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E2:21"><i><font color="Green">E21</font></i></a>, <a class="ref" href="cqc_the3.html#T18" target="_self">Th18</a></i>;<br/>
<a NAME="E8:21"/><b>then </b>
<font color="Maroon">c<sub>3</sub></font> <a href="cqc_the3.html#R2" target="_self">|-</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="cqc_the3.html#E6:21"><i><font color="Green">E24</font></i></a>, <a class="ref" href="cqc_the3.html#T9" target="_self">Th9</a></i>;<br/>
<b>hence </b><a NAME="E9:21"/>
<font color="Maroon">c<sub>1</sub></font> <a href="cqc_the3.html#R4" target="_self">|-|</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="cqc_the3.html#E5:21"><i><font color="Green">E23</font></i></a>, <a class="ref" href="cqc_the3.html#T18" target="_self">Th18</a></i>;<br/>


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